Engelstalig boek "Trace Elements - Catalysts for Health" van Michel & Frederic Deville. Paperback in bijna nieuwstaat, uitgebracht door CRAO Editions. De prijs bedraagt 7 euro.

"Oligotherapy - or the therapy applying trace elements - is a reality based on the knowledge of elementary biology as is the case with vitamins. Medical doctors, as well as those who have benefitted from the use of trace elements always wonder why trace elements are not officially taught and why the world of medicine has done without them until now. Similarly to vitamins, trace elements are essential to the functions, and consequently the health of all living organisms."